Skyline has loads of stuff shut, eastern part like south pit and excalibar, but a whole new section from the end of riding high back down to granada, not sure if its singletrack, think it is as its not marked as a fire road on the OS/google maps.
Its not 50/50 whether or not its worth parking in Glyncorwg or Afan for the Wall as the diversion takes you up the valley towards glyncorwg anyway, just means its a long boring route back when you finish.
All the closures are listed in that link above.
When everything is completed i think Afan is going to be awesome, updated Skyline, re-opened Penhydd, improved whites and the wall along with the newly opened family stuff.